# Pipe Schedule Chart PDF

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## Pipe Schedule Chart

A pipe schedule (SCH) is how the wall thickness of a pipe is described. It is not an actual measurement, but a guide number based on a wall thickness formula. Two pipes of the same diameter may have different schedules, which means they have different wall thicknesses.

A pipe schedule is a non-dimensional number that relates to the thickness of the wall and affects the inside diameter. It is used to help classify pipes for high or low pressure and temperature applications. Pipe size is specified with two non-dimensional numbers: a nominal pipe size (NPS) for inside diameter based on inches, and a schedule (Sched. or Sch.) for wall thickness.

### Pipe Schedule Chart

Nominal O.D. Inches 10s 10 40s & Std 40 80s & E.H. 80 160
1/8 .405 .049 .049 .068 .068 .095 .095
1/4 .540 .065 .065 .088 .088 .119 .119
3/8 .675 .065 .065 .091 .091 .126 .126
1/2 .840 .083 .083 .109 .109 .147 .147 .187
3/4 1.050 .083 .083 .113 .113 .154 .154 .218
1 1.315 .109 .109 .133 .133 .179 .179 .250
1 1/4 1.660 .109 .109 .140 .140 .191 .191 .250
1 1/2 1.900 .109 .109 .145 .145 .200 .200 .281
2 2.375 .109 .109 .154 .154 .218 .218 .343
2 1/2 2.875 .120 .120 .203 .203 .276 .276 .375
3 3.500 .120 .120 .216 .216 .300 .300 .437
3 1/2 4.000 .120 .120 .226 .226 .318 .318
4 4.500 .120 .120 .237 .237 .337 .337 .531
4 1/2 5.000 .247 .355
5 5.563 .134 .134 .258 .258 .375 .375 .625
6 6.625 .134 .134 .280 .280 .432 .432 .718
7 7.625 .301 .500
8 8.625 .148 .148 .322 .322 .500 .500 .906
9 9.625 .342 .500
10 10.750 .165 .165 .365 .365 .500 .593 1.125
11 11.750 .375 .500
12 12.750 .180 .180 .375 .406 .500 .687 1.312
14 14.000 .188 .250 .375 .437 .500 .750 1.406
16 16.000 .188 .250 .375 .500 .500 .843 1.593
18 18.000 .188 .250 .375 .562 .500 .937 1.781

Nominal pipe size (NPS) is the number that defines the size of the pipe. For example, when you say 6” pipe, the 6” is the nominal size of that pipe. However, for the pipe sizes, NPS 14 and above Outside Diameter is the same as NPS. To understand this concept, you have to learn the way pipes are manufactured.

The pipe schedule is the way pipe wall thickness is mentioned. To simplify the ordering of the pipe ASME committee has developed Schedule Number, which is based on modified Barlow’s wall thickness formula.

Definition of Schedule Number: The schedule number indicates an approximate value of the expression 1000 x P/S where P is the service pressure and S is the allowable stress, both expressed in pounds per square inch.

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